Updated the binding logic

1.Added getSeq() in ForeigneKeyMetaData.Entry interface for generating
index correctly as seq is important in index.
2.Added getParent() in TableMetaData
3.Updated the implementation logic of isMemberOfPrimaryKey(),
isMemberOfIndex() and isMemberOfUniqueIndex() methods, which related to
column metadata.
4. Updated the logic of binding relationship between column and index
entry, primary key entry and foreign key entry.